This little gem is in excellent condition. The optics and mechanics are perfect. Cosmetics are great, even the lettering is clean and bright. If you look close you will see few very light superficial marks on the body. This lens performs great for full frame cameras. I have used it on my 5DII with excellent results.
It currently has the rear shroud removed for use on Canon FF cameras. I will include the shroud, either attached or not, depending on your preference. $325 net to me.
I've got the 20/2.8 AIS with the shroud removed on FF Canon. Don't let the shroud issue be of a concern to keep you from this one. It's an easy on/easy off and you'll be using it with an adapter anyway ... unless of course, you're putting it on a native F mount.